<!DOCTYPE html>
<html lang="zh">

<head>
    <meta charset="UTF-8">
    <meta name="viewpor" content="width=deice-width,initial-scale=1.0">
    <title></title>
    <link href="https://cdn.bootcss.com/twitter-bootstrap/4.4.1/css/bootstrap.css" rel="stylesheet">
    <style>
        .row div {
            background-color: lightsteelblue;
            border: 1px red solid;
        }
    </style>
</head>

<body>
    <header>
        <h1>bootstrap练习</h1>
    </header>
    <main>
        <section>
            <h2>容器</h2>
            <div class="container-fluid" style="background-color: darkgrey;">星空</div>
            <div class="container-md" style="background-color: darkgrey;">星空</div>
        </section>
        <section>
            <div class="section">
                <div class="container">
                    <div class="row">
                        <div class="col-1">01</div>
                        <div class="col-2">02</div>
                        <div class="col-6">03</div>
                        <div class="col-3">04</div>
                        <div class="col">05</div>
                        <div class="col">06</div>
                        <div class="col">07</div>
                        <div class="col">08</div>
                        <div class="col">09</div>
                        <div class="col">10</div>
                        <div class="col">11</div>
                        <div class="col">12</div>
                        <div class="col">13</div>
                    </div>
                    </container>
                </div>
                <div class="container">
                    <div class="row my-3">
                        <div class="col-md-8 mr-3">wo</div>
                        <div class="col-md-3">ccdsfdf</div>
                    </div>
                </div>
                <div class="container">
                    <div class="row justify-content-center">
                        <div class="col-md-8">dcdffd</div>
                    </div>
                </div>
                <div class="container">
                    <div class="row">
                        <div class="col-md-8 offset-md-2">dcdffd</div>
                    </div>
                </div>
                <div class="container">
                    <div class="row justify-content-center">
                        <div class="col-md-8">
                            <div class="container">
                                <div class="row my-3">
                                    <div class="col-md-8 mr-3">wo</div>
                                    <div class="col-md-3">ccdsfdf</div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
        </section>
        <section>
            <h2>响应式图片</h2>
            <div class="container">
                <div class="row">
                    <div class="col-8"><img src="http://pn.gexing.com/shaitu/20130303/0938/5132a9a5d1457.jpg"
                            alt="bing星空" class="img-fluid">
                    </div>
                </div>
            </div>

        </section>
    </main>
    </div>
    </section>
    <footer></footer>
</body>

</html>